INFICON Explorer Portable Gas Chromatograph - Manual (Page 265)

Explorer Operator Manual
263
Backup Assay Files
Make a copy of all the updated assay files and store this backup disk in a safe place
with the original assay
CD. In addition to the assay file (.app) you should also store
the .pid and .ecd files that were used to update the assay.
Each time you update the assay information using the procedures above, you must
copy the updated assay and related files to your backup disk.
NOTE: Do not copy the updated files onto the original assay disk.
Always retain the original assay, as it contains the reference library. If for some
reason you must use the original assay, you must update the library information.
Remember to copy the original files from the disk to your local drive and then
update them.