PCV file stores security backup copy in ZIP format. PCV files are created with open-source software MozBackup, developed in 2004 and available until 2012. PCV files store Mozilla software backup copies.

MozBackup supports products such as Firefox, Thunderbird, Sunbird, Spacebird, Songbird, Netscape, Flock, Mozilla Suite, and SeaMonkey. Data in PCV files can be restored manually after decompressing PCV file. However, is it recommend tha users manage their PCV file using MozBackup.