backup has warnings?

[helpchrisplz]

hi just want to know if a backup that has the following warnings will have successfully backed up or not? will it of just stopped after it hit the error and not backed up the rest?

i have looked in the hosting and cant see any files with the names below so am not sure why it is erroring on them?

Warning: hosting "domain.co.uk"
Failed to pack files b4vpsgo_domain.co.uk_apache-files_1312092311 in /var/lib/psa/dumps/clients/domain/domains/domain.co.uk [ 925711060992 bytes free of 983175770112 bytes total on mount point 0]
Warning: hosting "domain.co.uk"
/bin/tar: httpdocs/var/session/sess_aotvbagd78vrb05gl0cj293ks2: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_1celcep29v99pgpvmo3lba0m75: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_u86ed17468ob6k14d6hom3h687: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_8nfbqf5ap0jseunbh6lb9mjf55: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_pq5diqes2t4joqs76mnj6c3dl1: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_6addpsp7che0hi5u7vhrvglmi2: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_1a7babis127tbrkl172r16rmo5: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_iqcq9ma7l7sr7nucp7abr7pji4: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_u48i8ug9l55gea1edg2e3ovi26: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_9olss4r4i4fmppmfi9ij2p9q71: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_rsgl4e599iupcofdfc9p5ha4g3: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_63dnbc6vvd7a0t7btucv21ul46: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_05vnhc4bf2hfufqainar3q6dk4: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_5lrjcp3ov3np5in6ivd1tkf842: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_a4k96sb8fvpqcton8i09ietb70: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_e7ti7c4dlseth35lu8614p8k35: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_9pck2atr9q71ndotn4ii2fpl14: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_fj7gktukeec8j1cq7m9ok46jh3: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_lp6d4f299oc99052liqnln0d36: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_t97lomjhamllq1o714krdip777: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_sgm362e9ifdqbh61almgbd3o66: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_33m8gfo52fdemi3gismhi1qn04: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_925celf6va2h26b3f2h1d2mmd2: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_o0mvjgh68lgj03vlgp6j6gei91: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_7mr7k7kmpc07rjpnl7ti04psh3: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_8kc635ijhtj75amf9aeofr46q5: Cannot stat: No such file or directory
/bin/tar: httpdocs/var/session/sess_ioslpmkpf1rnhoak546221i1c7: Cannot stat: No such file or directory
/bin/tar: Exiting with failure status due to previous errors

 

[IgorG]

What is your Plesk version and version of installed microupdate?

 

[helpchrisplz]

OS CentOS 6.5 (Final)
Panel version 11.5.30 Update #26, last updated at Dec 6, 2013 03:18 AM

 

[IgorG]

Have you tried backup this domain with enabled "Suspend domains until backup task is completed" option?

 

[helpchrisplz]

i deleted all the files in the var/session/ folder and it has worked. i didnt have to "Suspend domains"

the files are temporary files for shopping cart on magento.
in future should i just suspend domains? or will i have to delete the files. i want to set up a scheduled backup so dont really want to have to manually delete stuff that will make the backup fail.