Browsing through my recent Yosemite backup I noticed that two of the largest files were
com.apple.sidebarlists.plist (78 MB) and
com.apple.recentitems.plist (10 MB). Both files are located in
com.apple.sidebarlists.plist yields that the following key holds a huge amount of data under the key:
Is it normal for plist files to become so large? What kind of data is this (icon previews?) and why are the files so large?