Number of Backups (Bootmii)

How many backup from Bootmii do you keep for your Wii?

I know that this isn't a homebrew question as it is a personal computing preference. I backup my Wii on the 3 day weekends of MLK, Memorial & Labor day; and any special siatuions like pre and post Updates or Formats. They average 358MB each but are adding up to more than I prefer. I want to ditch some of them but don't know which ones to keep. I'm leaning to only keeping the original and the most recent 3-5. I Have Bootmii on boot2 so I can easily use bootmini.elf to restart from the original. However I don't recall how many formats I (personally) need to juggle for the correct FC and for SaveGame Manageer to not corrupt online games. What do you all think?

If your Wii is currently in working order, I see no reason to keep anything but the latest backup, and possibly the first backup should you ever want to go back to the state your Wii was in just after installing HBC/BootMii.