ああああーーーーー、11月上旬から無料アカウントのバージョンバックアップが３０日に制限された件
せっかく１０Ｇまで増やしたのに、有料アカに移行するか…orz

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What is Pack-Rat?
Pack-Rat is a Dropbox Pro add-on feature that saves your file history forever.

Dropbox saves a history of all deleted and earlier versions of files for 30 days for all Dropbox accounts by default.
If you have the Pack-Rat add-on, Dropbox saves those files for as long as you have the Pack-Rat add-on. With Pack-Rat, you never have to worry about losing an old version of a file.

Pack-Rat is available to all Dropbox Pro accounts.