Hello,
Can the backup have 2 different locations?
For example... Monday and Tuesday on the 1st external site and Saturday and Sunday on the 2nd external site.
Possible ?
Not directly form the Plesk UI or an extension I know of. If you like a little challenge however, you could try to utilize the Plesk CLI backup command to start manual backups via command line. I suppose you can run the backup command via a cron tabs. Running those cron tabs only for the days you want to backup to a specific location. It never tried it myself, but in theory I think this should be possible.