Hi hilip,
What Tech2 says is correct.
Any way:
You only need the last full backup and last differencial backup, or all the incremental backups till the date of restore, if you need a full system restore.
If you are looking for a specific file
May be the file you are looking for is in the last backup.
In differencial backups the file is in the last diferential backup, but in Incremental, if the file is not in the last, you have to find it in the day before.
Regards,
JoaoMatos