#208215 restore and delete not working when files directory is specified with an absolute path. reported and investigated by skizzo and AntoineLafontaine

#193862 unable to write to backup directory when files dir is specified relative to the server root. thx to josedazag for initial report, dugh for finding the problem and wizian for finding the fix

#195706 configurable timestamp format on scheduled backup, #202207 empty backup files when downloaded. thanks xushi

#190117 tokens for backup names and custom timestamps