That is a strange side effect, I have not see it before.
How often you do a backup depends on how valuable your information is. For many of us, a weekly backup will insure the majority of our data is recoverable.
If your is very important, doing a daily sync or backup would be justified. It only take a couple mins.
Well I have only had my phone a week. I have backed up everytime I added or deleted something. I am still learning and wanted to know what others do.
~ VNDLEWIS
Posted from my CrackBerry at wapforums.crackberry.com
This is because your wallpaper is stored on your memory card, not internal to your BB,
If you get a call while you're tethering, it will be a default ringer internal to the BB that rings.
The way around this is to either move your wallpaper image from your card to your BB or just do a soft reset/battery pull after you disconnect. This isn't a bad habit anyway, since your media will not always be cataloged right till you reboot anyway.