Advance backup keep options

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In my setup I like to keep one backup which will be move to another location after Gitlab has it created.

For that I set the keep_time to 300 seconds (the backup runs hourly) so that Gitlab will remove every other backup.

But if I perform a full backup this takes longer than an hour so the backup removes itself.

So I think we should change this behavior.

• Remove old backups before creating another one?
• Exclude the current backup from the removal?
• Add option to define the number of backups which should be kept?