ABSTRAK
Penelitian ini membahas tentang metode preservasi digital yang diterapkan oleh PPM Knowledge Center Tanoto Library dalam melakukan kegiatan preservasi digital terhadap koleksi tesis dan skripsi digital dan kendala yang dihadapi dalam melakukan kegiatan preservasi digital, berikut dengan solusi yang dimiliki oleh PPM Knowledge Center Tanoto Library dalam menghadapi kendala yang dimiliki. Penelitian ini merupakan penelitian kualitatif dengan desain deskriptif. Penelitian ini memperoleh data dengan melakukan kegiatan observasi dan wawancara kepada informan yang ditulis dalam bentuk naratif. Hasil penelitian ini menunjukkan bahwa PPM Knowledge Center Tanoto Library telah menerapkan beberapa metode preservasi digital dalam kegiatan preservasi digital terhadap koleksi tesis dan skripsi seperti preservasi teknologi, penyegaran (refreshing), migrasi, serta arkeologi data.

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ABSTRACT
This study discusses about the methods of digital preservation applied in PPM Knowledge Center Tanoto Library in preserving their thesis collection and the difficulties their dealing with, along with the solution to overcome the difficulties. This study is a qualitative study using descriptive design. The research data included in this study were obtained through observation and interviewing informants, which was written in narrative order. This study shows that PPM Knowledge Center Tanoto Library already applied some of the methods in digital preservation in preserving their thesis collection such as: technology preservation, refreshing, migration, and data archeology. The Librarians are already aware of the significance in choosing the right method in preserving digital collection, nevertheless there are some obstacles to deal with.