If you're going to perform a full gallery wipe, do yourself the courtesy of also deleting your own copies of everything. At least make sure the wipe is permanent.
Personally if I ran a furry site, anyone doing a full gallery wipe would get a minimum 6 month automatic ban. Kind of figure if they're going away, then they won't really mind. If they want to wipe and resubmit after a week for pretend "I'm sorry" sympathy then they can't do that.
Better yet, do what most social media sites do- give an option to close an account. This would lock the username from future use, but also either wipe the gallery or hide everything from view. 3 month minimum. After that they can reactivate the account if they wish, but after 1 year all submissions are purged and the lock becomes permanent.
And trust me on this, if you're not popufur or if you're a drama magnet(or you're both), wiping your gallery isn't going to matter. All of 10 people may even notice. No one is going to beg you to stay. If you're a drama magnet, it's just going to dump more shit on the pile of things people don't like you for(but seriously, everything you do probably pisses off someone so what does it matter?). You want sympathy? You won't get it over a gallery wipe. If you wipe, do it because you wish to get the fuck out and no other reason, just don't expect anyone to miss you. Non-popufurs don't matter and some other artist will replace you in less than a day.